LM is right, protonix is used to treat GERD, which is often present with thyroid issues.
What thyroid problem do you have? Are you on thyroid med? If so, what med, what dose(s)? Can you post your latest thyroid blood test results, along with the reference ranges (these ranges vary from lab to lab, so must come from your own report)?
Its a stomach acid stopper, not BP med! Goggle it. You doc has a communication issue it sounds like.